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  1. Located directly east of St. Louis, the county is part of the Metro East region of the Greater St. Louis metropolitan area in southern Illinois. As of the 2020 United States census, St. Clair County had a population of 257,400, making it the third most populous county in Illinois outside the Chicago metropolitan area.

  2. 1 day ago · Welcome To St. Clair County. St. Clair County is home to Scott Air Force. Scott Air Force Base pumps about $2 billion a year into the region's economy. With more than 13,000 employees, Scott is one of the top five employers in the St. Louis region.

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  4. St. Clair County. Gov. St. Clair and Judges organized the County of St. Clair in the year 1790 when he was Governor, and Illinois formed a part of the great Northwest territory, and is the oldest county in the State; indeed it had an organized existence before Illinois was created a State or Territory.

  5. Apr 30, 2024 · Guide to St. Clair County, Illinois ancestry, genealogy and family history, birth records, marriage records, death records, census records, family history, and military records.

  6. Located in the heart of the Midwest, St. Clair County boasts a rich history and a diverse community. Our county is home to a variety of thriving industries, including healthcare, manufacturing, and transportation. We are also proud to be the home of Scott Air Force Base, a key military installation that contributes greatly to our local economy.

  7. Jul 1, 2022 · St. Clair County, Illinois. QuickFacts provides statistics for all states and counties. Also for cities and towns with a population of 5,000 or more.

  8. Website. www .co .st-clair .il .us. St. Clair County is the oldest county in the U.S. state of Illinois. According to the 2020 census, it had a population of 257,400, [1] making it the ninth-most populous county in Illinois. Its county seat is Belleville. [2] The county was founded in 1790, before the establishment of Illinois as a state.

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